The OEIS is supported by the many generous donors to the OEIS Foundation.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 2 |
| 3 | 4 |
| 4 | 8 |
| 5 | 15 |
| 6 | 31 |
| 7 | 126 |
| 8 | 240 |
| 9 | 943 |
| 10 | 3992 |
| 11 | 15073 |
| 12 | 60221 |
| 13 | 508875 |
| 14 | 1923344 |
| 15 | 15346988 |
| 16 | 129704729 |
| 17 | 978528991 |
| 18 | 7823328579 |
| 19 | 131906890104 |
| 20 | 997545267990 |
| 21 | 15909346537935 |
| 22 | 268935937214485 |
| 23 | 4056896542025441 |
| 24 | 64868711455854407 |
| 25 | 2187311046708551809 |
[1,2,2,4,8,15,31,126,240,943,3992,15073,60221, 508875,1923344,15346988,129704729,978528991, 7823328579,131906890104,997545267990, 15909346537935,268935937214485,4056896542025441, 64868711455854407,2187311046708551809] |